Container for grease



UNITED STATES PATENT OFFICE.

CLARENCE ROBBINS, OF UNIVERSITY, MISSOURI.

CONTAINER FOR GREASE, OIL, 8w.

N0 Drawing.

To all whom it may concern:

Be it known that I, CLARENCE Ronnrxs, a citizen of the United States of America, a resident of University, in the county of St. Louis, State of Missouri, have invented certain new and useful Improvements in Containers for Grease, Oil, &c., of which themetal and other relatively expensive materials. Owing to the-scarcity and high cost of sheet metal, many attempts have been made to produce paper containers for grease and oil, but in so far as I am aware none of these attempts have met with success. There is a very great demand for inexpensive containers of this kind, made of paper, for the pa er can beeasily obtained at a low cost.

rease and oil will very readily permeate -and pass through paper and analogous fibrous material; and many substances adapted for use as a coating for the paper will be dissolved by grease and oil. Obviously, a coating soluble in grease or oil would not perform the desired function. F urtherniore,

' grease such as lubricating grease and lard,

or lard substitutes, are usually melted and poured into their containers at a temperature of about 185 F., and many products heretofore used as a coating for paper will also melt at this temperature. In addition to this, the container is subjected to great changesof temperature, for example, from 185 F. to 0 F., and if a paper container is coated to prevent permeation of the grease, the protective coating should be elastic enough to withstand such changes in temperature without breaking or cracking. Briefly stated, an ideal protective coating would not mix with, nor be dissolved by, the grease and oil. It would not melt at the temperature to which the grease is subjected, and its efficiency should not be im aired by contact with the grease or oil, nor b y the expansion and contraction resulting from changes of temperature.

My ob ect is to provide a container coated Specification of Letters Patent.

with a composition consisting of a combination of ingredients mixed with each other in .proper proportion to constitute a most effectlve means for protecting paper containers and the like from the action of grease and oil, it being understood, however, that thecomposition herein disclosed can be modified for use with different kinds of grease and different kinds of oils.

The composition preferably comprises a volatile solvent, a resin dissolved therein, a relatively non-volatile and viscous liquid whereby the product is rendered elastic to withstand expansion and contraction, and

a binder and filler.

If the container is to be used for food products, I prefer to use ethyl alcohol as a solvent, but it is to be understood that the invention is not limited to the use of this particular kind of alcohol. Methyl alcohol could be used, and if the container is to be used for lubricating grease or lubricating oils, entirely satisfactory results could be ob- .tained by substitutlng for thealcohol, a volatile petroleum spirit, or a volatile coal tar solvent such as benzol.

Ethyl alcohol maybe considered as the preferred solvent for the reason that it possesses all of the desired properties, and

its constituents will not impair or in any way contaminate the food products WlllCil come into contact with the protective coat- Patented Dec. 16, 1919 Application filed March 5, 1918. Serial No. 220,450. i

peratures, and which will'not be liable to dry or harden when exposed to the air or to the contents of the container. T1118 mgredient may be derived from anlmal fats or vegetable oils, and it is preferably glycerin or castor oil. Both of the last mentioned elements have the necessary propermes.

In addition to the above, the new composition preferably includes a binder and filler which may consist of magnesium carbonate and silica.

Specifically stated, I have found that very satisfactory results can be obtained by making the composition as follows:

475 pounds of gum resin,

659 pounds of ethyl alcohol (volatile solvent).

45 pounds of glycerin, (animal fat.)

54 pounds-of ethyl alcohol (thinner),

36 pounds of magnesium carbonate.

36 pounds of silica.

The 475 pounds of gum resin is dissolved in the 659 pounds of ethyl alcohol, and to this I add the relatively small quantities of glycerin and ethyl alcohol, the latter being a thinner for the glycerin, also adding the binder and filler consisting of magnesium carbonate and silica.

This composition can be applied, in any suitable manner, to the inner face of a container made of paper or other fibrous material. It will adhere firmly to the paper so as to form a permanent elastic lining for the container, and actual tests extending over a considerable period of time have shown that the composition herein disclosed, when combined with a paper container, possesses all of the advantages herein pointed out.

I claim:

1. A container made of fibrous material and provided with a grease-proof coatmg comprising resin, a non-hardening viscous oily liquid mixed therewith to render the product elastic, and a binder and filler mixed with the aforesaid ingredients.

2. A container provided with a coating comprising the following elements combined in approximately the following proportions, 475 parts resin, 45 parts nonhardening viscous substance mixed with the resin to render the product elastic, and a binder and filler mixed with the aforesaid ingredients.

3. A container provided with a coating comprising the following elements combined in approximately the following proportions, 47 5 parts resin, 45 parts castor oil, 36 parts magnesium'carbonate, and 36 parts silica.

In testimony that I claim the foregoing I hereunto aflix my signature.

CLARENCE ROBBINS. 

